SMG4: The E G G is the twelfth episode of Season 10 and the five hundred and sixty-fifth overall to be uploaded by SMG4.
JubJub Boopkins makes his debut. It was aired on April 4, 2020.
The blooper begins with Mario, Tari, and Fishy Boopkins on an island, trying to replicate Animal Crossing in real life as Tari stated. As they intended to give up and go back home, Boopkins later came back with an egg which Mario took it for cooking dinner. Boopkins and Tari eventually attempted to spare the egg, but Mario refused and proceeded to prepare to cook it. The egg, however, hatched to reveal a newborn creature. Tari was pleased to see the creature, but Mario kicked the creature, resulting in Boopkins criticizing Mario. Boopkins greeted the creature and asked his name. The creature was unable to speak accurately until he stated "JubJub". Boopkins named the creature JubJub, pleasing him.
At the castle, Mario and Tari were seen playing Rock Tac Toe where Tari won the game. Boopkins asked JubJub of the location of his parents but he still could not speak accurately. Tari let Mario win Rock Tac Toe as Mario then threw JubJub at the wall, having Boopkins criticizing him for the abuse again.
Boopkins and JubJub later toured the castle until JubJub began to miss his father, with Boopkins volunteering to assist.
In town, the group tried finding Jubjub's parents when Mario attempted to sell JubJub for cash, but Fishy Boopkins refused to allow him to do so, as the Old Man Hobo wished to eat JubJub for lunch.
Suddenly, JubJub started sucking on a Koopa Troopa's head. Boopkins tried stopping him so that they could continue to search for his father, but JubJub repeatedly sucked on the head until Boopkins scolded him for this. Unfortunately, JubJub let out a tantrum cry as the attempts to calm JubJub failed. However, Boopkins persuaded JubJub to behave himself. Boopkins later punished JubJub and sent him to a time out while told Mario to keep an eye on him, but JubJub suddenly escaped.
Still unsure as to where his father was, JubJub decided to search for him by himself. He seemingly found him when he discovered Ghost Rider, who had a Kraken head picture on the back of his shirt. With Ghost Rider unaware of Jubjub being on his back, he and his gang rode off.
While Mario drove around looking for Jubjub, he suddenly saw him. Shortly after that and while giving chase, Ghost Rider found Jubjub and was confused as to why he was attached to him but nevertheless kept him to his side. He then noticed the gang going after them and told his gang members to slow them down. Eventually, after a high-speed chase, they ended up at a pier. There, the bikers and the gang confronted each other, with Ghost Rider (who realized that Jubjub followed him because of his jacket design) showed him the jacket. Jubjub became more conflicted as to who should he go to. Eventually, he decided to go to Ghost Rider, pleasing him until Jubjub suddenly went by him. Everyone could only look on shocked as Jubjub jumped into the ocean. He seemingly drowned but being aquatic, he was actually fine. Turned out Jubjub sensed his father and joined him.
The moment the father came up, the biker gang decided to retreat while the gang recognized the father, Joe Boopkins. It turned out Joe Boopkins is Jubjub's father, making Jubjub Boopkins' younger brother the entire time. Founding it sweet, Tari declared that the episode was going to have a heartwarming ending. However, Mario declared he hated it and wanted to make it more manly. He proceeded to kick JubJub one more time, which naturally led to Joe Boopkins smashing him in retribution.